/*
 * px.h
 *		Header file for pgcrypto.
 *
 * Copyright (c) 2001 Marko Kreen
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *	  notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *	  notice, this list of conditions and the following disclaimer in the
 *	  documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * contrib/pgcrypto/px.h
 */

#ifndef __PX_H
#define __PX_H

#include <sys/param.h>

/* keep debug messages? */
#define PX_DEBUG

/* a way to disable palloc
 * - useful if compiled into standalone
 */
#ifndef PX_OWN_ALLOC
#define px_alloc(s) palloc(s)
#define px_realloc(p, s) repalloc(p, s)
#define px_free(p) pfree(p)
#else
void *px_alloc(size_t s);
void *px_realloc(void *p, size_t s);
void px_free(void *p);
#endif

/* max len of 'type' parms */
#define PX_MAX_NAMELEN 128

/* max salt returned */
#define PX_MAX_SALT_LEN 128

/*
 * PX error codes
 */
#define PXE_OK 0
#define PXE_ERR_GENERIC -1
#define PXE_NO_HASH -2
#define PXE_NO_CIPHER -3
#define PXE_NOTBLOCKSIZE -4
#define PXE_BAD_OPTION -5
#define PXE_BAD_FORMAT -6
#define PXE_KEY_TOO_BIG -7
#define PXE_CIPHER_INIT -8
#define PXE_HASH_UNUSABLE_FOR_HMAC -9
#define PXE_DEV_READ_ERROR -10
#define PXE_BUG -12
#define PXE_ARGUMENT_ERROR -13
#define PXE_UNKNOWN_SALT_ALGO -14
#define PXE_BAD_SALT_ROUNDS -15
#define PXE_MCRYPT_INTERNAL -16
#define PXE_NO_RANDOM -17
#define PXE_DECRYPT_FAILED -18

#define PXE_PGP_CORRUPT_DATA -100
#define PXE_PGP_CORRUPT_ARMOR -101
#define PXE_PGP_UNSUPPORTED_COMPR -102
#define PXE_PGP_UNSUPPORTED_CIPHER -103
#define PXE_PGP_UNSUPPORTED_HASH -104
#define PXE_PGP_COMPRESSION_ERROR -105
#define PXE_PGP_NOT_TEXT -106
#define PXE_PGP_UNEXPECTED_PKT -107
/* -108 is unused */
#define PXE_PGP_MATH_FAILED -109
#define PXE_PGP_SHORT_ELGAMAL_KEY -110
/* -111 is unused */
#define PXE_PGP_UNKNOWN_PUBALGO -112
#define PXE_PGP_WRONG_KEY -113
#define PXE_PGP_MULTIPLE_KEYS -114
#define PXE_PGP_EXPECT_PUBLIC_KEY -115
#define PXE_PGP_EXPECT_SECRET_KEY -116
#define PXE_PGP_NOT_V4_KEYPKT -117
#define PXE_PGP_KEYPKT_CORRUPT -118
#define PXE_PGP_NO_USABLE_KEY -119
#define PXE_PGP_NEED_SECRET_PSW -120
#define PXE_PGP_BAD_S2K_MODE -121
#define PXE_PGP_UNSUPPORTED_PUBALGO -122
#define PXE_PGP_MULTIPLE_SUBKEYS -123

typedef struct px_digest PX_MD;
typedef struct px_alias PX_Alias;
typedef struct px_hmac PX_HMAC;
typedef struct px_cipher PX_Cipher;
typedef struct px_combo PX_Combo;

struct px_digest
{
	unsigned (*result_size)(PX_MD *h);
	unsigned (*block_size)(PX_MD *h);
	void (*reset)(PX_MD *h);
	void (*update)(PX_MD *h, const uint8 *data, unsigned dlen);
	void (*finish)(PX_MD *h, uint8 *dst);
	void (*free)(PX_MD *h);
	/* private */
	union
	{
		unsigned code;
		void *ptr;
	} p;
};

struct px_alias
{
	char *alias;
	char *name;
};

struct px_hmac
{
	unsigned (*result_size)(PX_HMAC *h);
	unsigned (*block_size)(PX_HMAC *h);
	void (*reset)(PX_HMAC *h);
	void (*update)(PX_HMAC *h, const uint8 *data, unsigned dlen);
	void (*finish)(PX_HMAC *h, uint8 *dst);
	void (*free)(PX_HMAC *h);
	void (*init)(PX_HMAC *h, const uint8 *key, unsigned klen);

	PX_MD *md;
	/* private */
	struct
	{
		uint8 *ipad;
		uint8 *opad;
	} p;
};

struct px_cipher
{
	unsigned (*block_size)(PX_Cipher *c);
	unsigned (*key_size)(PX_Cipher *c); /* max key len */
	unsigned (*iv_size)(PX_Cipher *c);

	int (*init)(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv);
	int (*encrypt)(PX_Cipher *c, const uint8 *data, unsigned dlen, uint8 *res);
	int (*decrypt)(PX_Cipher *c, const uint8 *data, unsigned dlen, uint8 *res);
	void (*free)(PX_Cipher *c);
	/* private */
	void *ptr;
	int pstat; /* mcrypt uses it */
};

struct px_combo
{
	int (*init)(PX_Combo *cx, const uint8 *key, unsigned klen,
				const uint8 *iv, unsigned ivlen);
	int (*encrypt)(PX_Combo *cx, const uint8 *data, unsigned dlen,
				   uint8 *res, unsigned *rlen);
	int (*decrypt)(PX_Combo *cx, const uint8 *data, unsigned dlen,
				   uint8 *res, unsigned *rlen);
	unsigned (*encrypt_len)(PX_Combo *cx, unsigned dlen);
	unsigned (*decrypt_len)(PX_Combo *cx, unsigned dlen);
	void (*free)(PX_Combo *cx);

	PX_Cipher *cipher;
	unsigned padding;
};

int px_find_digest(const char *name, PX_MD **res);
int px_find_hmac(const char *name, PX_HMAC **res);
int px_find_cipher(const char *name, PX_Cipher **res);
int px_find_combo(const char *name, PX_Combo **res);

void px_THROW_ERROR(int err) pg_attribute_noreturn();
const char *px_strerror(int err);

const char *px_resolve_alias(const PX_Alias *aliases, const char *name);

void px_set_debug_handler(void (*handler)(const char *));

void px_memset(void *ptr, int c, size_t len);

#ifdef PX_DEBUG
void px_debug(const char *fmt, ...) pg_attribute_printf(1, 2);
#else
#define px_debug(...)
#endif

#define px_md_result_size(md) (md)->result_size(md)
#define px_md_block_size(md) (md)->block_size(md)
#define px_md_reset(md) (md)->reset(md)
#define px_md_update(md, data, dlen) (md)->update(md, data, dlen)
#define px_md_finish(md, buf) (md)->finish(md, buf)
#define px_md_free(md) (md)->free(md)

#define px_hmac_result_size(hmac) (hmac)->result_size(hmac)
#define px_hmac_block_size(hmac) (hmac)->block_size(hmac)
#define px_hmac_reset(hmac) (hmac)->reset(hmac)
#define px_hmac_init(hmac, key, klen) (hmac)->init(hmac, key, klen)
#define px_hmac_update(hmac, data, dlen) (hmac)->update(hmac, data, dlen)
#define px_hmac_finish(hmac, buf) (hmac)->finish(hmac, buf)
#define px_hmac_free(hmac) (hmac)->free(hmac)

#define px_cipher_key_size(c) (c)->key_size(c)
#define px_cipher_block_size(c) (c)->block_size(c)
#define px_cipher_iv_size(c) (c)->iv_size(c)
#define px_cipher_init(c, k, klen, iv) (c)->init(c, k, klen, iv)
#define px_cipher_encrypt(c, data, dlen, res) \
	(c)->encrypt(c, data, dlen, res)
#define px_cipher_decrypt(c, data, dlen, res) \
	(c)->decrypt(c, data, dlen, res)
#define px_cipher_free(c) (c)->free(c)

#define px_combo_encrypt_len(c, dlen) (c)->encrypt_len(c, dlen)
#define px_combo_decrypt_len(c, dlen) (c)->decrypt_len(c, dlen)
#define px_combo_init(c, key, klen, iv, ivlen) \
	(c)->init(c, key, klen, iv, ivlen)
#define px_combo_encrypt(c, data, dlen, res, rlen) \
	(c)->encrypt(c, data, dlen, res, rlen)
#define px_combo_decrypt(c, data, dlen, res, rlen) \
	(c)->decrypt(c, data, dlen, res, rlen)
#define px_combo_free(c) (c)->free(c)

extern void crypt_free(void *ptr);
extern void *crypt_alloc(int size);
extern void *crypt_realloc(void *ptr, int size);
extern void *crypt_memset(void *s, int c, size_t n);
#endif /* __PX_H */
